Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec30aa0e6b3bafb4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 03:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6598cd40d50a73a4005a66c8e6d7585f SHA-1: c220dc5c83a2b8d7dca97bb7530bb9f8559ffe07 SHA-256: ec30aa0e6b3bafb4409fcc91af50c824907259e665ae18e8978d4b25bd471826
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with critical and high severity firings. It contains embedded JavaScript and multiple external URIs, including one pointing to 'queure.ru', suggesting an attempt to redirect the user to a malicious site. The PDF structure and numerous links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://queure.ru/uplcv?utm_term=lizzie+mcguire+putlocker PDF link annotation
    • https://mandarinusa.com/userfiles/file/1631393389.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/20328905454.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kosij.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vepigokido.pdfIn PDF document text
    • http://briztravel.com/upload/files/19279899672.pdfIn PDF document text
    • https://dm288.com/slicice/file/76028181532.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/lujironajokofira.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/55378227694.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/44277084880.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/5624133049.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/71072798106.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/7384632877.pdfIn PDF document text
    • https://suruburi.net/mm/file/zudobela.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wimosutu.pdfIn PDF document text
    • https://maviet.vn/upload/files/sijuguwoverowi.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/mixisopasefezewutanopiso.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210902005934.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/vojezopiwa.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/tusatoketavig.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/87854791324.pdfIn PDF document text
    • https://polandpools.com/contents/files/bijinibiwesijivuvaviwe.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/6392700900.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/18821054024.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c008b038---56349540304.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 10492 bytes
SHA-256: 19d71d815c844d1b32198384231cb901c33064e41c9bb45eafe489e25100cfe9
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 16792 bytes
SHA-256: 66a24b16d0e40f5af3e58d8d7507d93ceb2283a1eb873b619ca07e4342abbae3